A natural, reclaimed, or synthetic rubber composition, sometimes mixed with a small amount of granulated cork. It may be all rubber, or the rubber may be coated or impregnated to a woven textile fabric; the adhesive side is usually backed with a holland linen fabric. It is used as a moisture, oil, flame, and grease-resistant sealer between metal joints and as a sealing and packing agent around door and window panels. Excludes: TAPE, INSULATION, ELECTRICAL; TAPE, PRESSURE SENSITIVE ADHESIVE; TAPE, SEMI-CONDUCTING, ELECTRICAL; and TAPE, SHIELDING, ELECTRICAL.